For a machine that he is designing, Kurt needs a material that has a high vapor pressure at moderate temperature. To determine what kind of molecules have higher vapor pressures, he used a computer program to simulate the motion of particles in a sample. Screenshots of two of his trials are shown below. Based on these screenshots, what was Kurt's computer program designed to tell him about the materials being simulated?
A.
the material's phase
B.
the material's conductivity
C.
the material's reactivity
D.
all of these